Blade and wind turbine generator set

Abstract

The application provides a kind of blade and wind turbine unit.The blade includes suction surface shell and pressure surface shell;Web is supported between the suction surface shell and the pressure surface shell along the blade span, which divides the blade cavity into front cavity on the leading edge side and rear cavity on the trailing edge side;Air bag is arranged in at least one of the front cavity and the rear cavity, the air bag is filled with gas and is attached to the inner surface of the front cavity or the rear cavity.According to the application, the structural damping of the blade under low-order mode and high-order mode can be improved simultaneously, and the blade impact and fatigue load as well as the blade stall flutter or bending-torsional coupled flutter can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind power generation, and more particularly, to a blade and a wind turbine generator set. BACKGROUND

[0002] The structural damping ratio of the blade of the wind turbine generator set is usually about 0.1%-0.7%, and the blade-blade wheel system is prone to stall, bending-torsion coupled flutter and other phenomena due to the insufficient structural damping of the blade under the action of wind load.

[0003] In the prior art, the blade can be damped by a dynamic absorber, an oil damping device and a piezoelectric device. However, the dynamic absorber can only damp a certain frequency of the blade and cannot improve the structural damping of the blade as a whole. The oil damping device is not suitable for installation in a narrow blade cavity due to its complex structure, and is prone to oil leakage and stuck slider failures, thereby reducing the reliability of the system. Although the piezoelectric material in the piezoelectric device can generate strain in the structure by electric current to increase the damping of the blade, the system consumes electric energy and the piezoelectric device has a short service life, in addition, an additional controller is required, resulting in high cost. SUMMARY

[0004] The present application aims to provide a blade and a wind turbine generator set capable of simultaneously improving the structural damping of the blade under low-order modal and high-order modal.

[0005] Another object of the present application is to provide a blade and a wind turbine generator set capable of effectively reducing the impact and fatigue load of the blade.

[0006] Another object of the present application is to provide a blade and a wind turbine generator set capable of effectively reducing the stall flutter or bending-torsion coupled flutter of the blade.

[0007] According to one aspect of the present application, a blade is provided, which comprises: a suction surface shell and a pressure surface shell; a web supported between the suction surface shell and the pressure surface shell along a span direction of the blade, dividing an inner cavity of the blade into a front cavity on a leading edge side and a rear cavity on a trailing edge side; and a gas bag arranged in at least one of the front cavity and the rear cavity, the gas bag being filled with gas and being in contact with an inner surface of the front cavity or the rear cavity. By arranging the gas bag in at least one of the front cavity and the rear cavity, when the blade deforms, relative shear motion occurs between the gas bag and the surface of the blade, and under the action of the internal gas pressure of the gas bag, the friction between the gas bag and the surface of the blade is large, which can increase the structural damping of the blade itself. Therefore, the blade according to the present application can simultaneously improve the structural damping of the blade under low-order modal and high-order modal, and can reduce the impact and fatigue load of the blade and the stall flutter or bending-torsion coupled flutter of the blade.

[0008] Optionally, the air bag comprises a hollow hole penetrating the air bag. By providing a hollow hole penetrating the air bag in the air bag, the air bag has a hollow structure, and the air bag can be deformed more easily when the blade is deformed, so that the air bag can be more closely attached to the inner surface of the front cavity or the rear cavity, increasing the friction area with the same, further increasing the structural damping.

[0009] Optionally, the blade comprises a plurality of front cavity baffles supported between the suction surface shell and the pressure surface shell in the front cavity, the plurality of front cavity baffles being separated from each other in the spanwise direction of the blade to divide the front cavity into a plurality of front cavity subspaces.

[0010] Optionally, the air bag comprises a plurality of front cavity air bags, at least one of the front cavity air bags being provided in each of the plurality of front cavity subspaces. According to the present application, by dividing the front cavity into a plurality of front cavity subspaces and providing at least one front cavity air bag in each front cavity subspace, the shape of the front cavity air bag can be designed more easily according to the shape of each front cavity subspace, so that the front cavity air bag is better attached to the wall surface of the front cavity subspace, thereby further increasing the structural damping of the blade itself.

[0011] Optionally, at least two front cavity air bags are provided in each of the plurality of front cavity subspaces, the at least two front cavity air bags being attached to each other, and the shapes of the at least two front cavity air bags being different from each other. Thus, the shapes of the at least two front cavity air bags can be designed according to the shape change of the front cavity subspace in the chordwise direction to increase the contact area of the front cavity air bag with the inner surface of the front cavity subspace. In addition, the at least two front cavity air bags with different shapes can be attached to each other, so that when the blade is deformed, the front cavity air bags can rub against each other in addition to rubbing against the inner surface of the blade, releasing vibration energy in the form of friction heat, thereby improving the structural damping of the blade.

[0012] Optionally, each of the front cavity baffles comprises at least two front cavity baffle parts separated from each other in the chordwise direction of the blade, and the width of each front cavity baffle part in the chordwise direction of the blade is 1 / 20-1 / 5 of the chord length of the blade at the position. The front cavity air bags adjacent to each other in the spanwise direction of the blade are attached to each other through the space between the front cavity baffle parts. Thus, the attachment area between the air bags adjacent to each other in the spanwise direction is increased without significantly increasing the weight of the blade, thereby improving the structural damping of the blade. If the width of each front cavity baffle part in the chordwise direction of the blade is greater than 1 / 5 of the chord length of the blade at the position, the space between the front cavity baffle parts can be too small to cause the attachment area between the front cavity air bags adjacent to each other in the spanwise direction of the blade to be too small, and in addition, the weight of the front cavity baffle can be too heavy to increase the weight of the blade.

[0013] Optionally, the blade comprises a plurality of rear cavity baffles supported between the suction surface shell and the pressure surface shell in the rear cavity, the plurality of rear cavity baffles being separated from each other in the spanwise direction of the blade to divide the rear cavity into a plurality of rear cavity subspaces.

[0014] Optionally, the air bag comprises a plurality of rear cavity air bags, at least one rear cavity air bag being arranged in each of the plurality of rear cavity subspaces. According to the present application, by dividing the rear cavity into a plurality of rear cavity subspaces and arranging at least one rear cavity air bag in each of the rear cavity subspaces, the shape of the rear cavity air bag can be designed according to the shape of each rear cavity subspace, so that the rear cavity air bag better fits the wall surface of the rear cavity subspace, thereby further increasing the structural damping of the blade itself.

[0015] Optionally, at least two rear cavity air bags are arranged in each of the plurality of rear cavity subspaces and fit each other, the shapes of the at least two rear cavity air bags being different from each other. Thus, the shapes of the at least two rear cavity air bags can be designed according to the shape change of the rear cavity subspace in the chordwise direction to increase the contact area of the rear cavity air bag with the inner surface of the rear cavity subspace. In addition, the at least two rear cavity air bags with different shapes can fit each other, so that when the blade deforms, the rear cavity air bags can rub against each other in addition to rubbing against the inner surface of the blade, thereby releasing vibration energy in the form of friction heat, thereby improving the structural damping of the blade.

[0016] Optionally, each of the rear cavity baffles comprises at least two rear cavity baffle parts separated from each other in the chordwise direction of the blade, the width of each rear cavity baffle part in the chordwise direction of the blade being 1 / 20-1 / 5 of the chord length of the blade at that position. The rear cavity air bags adjacent to each other in the spanwise direction of the blade fit each other through the space between the rear cavity baffle parts. Thus, the fitting area between the air bags adjacent to each other in the spanwise direction of the blade is increased without significantly increasing the weight of the blade, thereby improving the structural damping of the blade. If the width of each rear cavity baffle part in the chordwise direction of the blade is greater than 1 / 5 of the chord length of the blade at that position, the space between the rear cavity baffle parts can be too small to cause the fitting area between the rear cavity air bags adjacent to each other in the spanwise direction of the blade to be too small, and in addition, the weight of the rear cavity baffle can be too heavy to increase the weight of the blade.

[0017] Optionally, the front cavity air bag and the rear cavity air bag are distributed in the spanwise direction of the blade at a distance of one-third to four-fifths of the blade root of the blade. This is because the deformation of the blade near the blade root is small and it is not necessary to arrange air bags, and near the blade tip position, the inner cavity of the blade is small and there is not enough space to arrange air bags.

[0018] Optionally, a front cavity air bag is arranged in each of the plurality of front cavity subspaces, the front cavity air bag having an ellipsoid shape, the area of the chordwise cross section of the middle part of the ellipsoid shape being the largest, and the area of the chordwise cross section of the ellipsoid gradually decreasing towards the blade root and the blade tip. Two rear cavity air bags are arranged in each of the plurality of rear cavity subspaces, the rear cavity air bag close to the web having a truncated cone shape or a cylindrical shape, and the rear cavity air bag close to the trailing edge of the blade having a triangular prism shape or a cylindrical shape. By arranging the front cavity air bag and the rear cavity air bag having the above shapes, the contact area between the air bag and the inner surface of the front cavity or the rear cavity can be increased, thereby increasing the structural damping of the blade itself.

[0019] Optionally, protrusions are arranged on the surface of the air bag. When the protrusions are arranged on the surface of the air bag, the friction between the air bag and the inner wall surface of the blade can be increased, the friction between the air bag and the web can be increased, and the friction between the adjacent air bags adhering to each other can be increased, thereby further improving the structural damping of the blade.

[0020] Optionally, the blade includes an inflation hole penetrating through the pressure surface shell, and the air bag includes an air nozzle penetrating out of the inflation hole and fixed to the surface of the blade. By arranging the inflation hole on the pressure surface shell, the influence on the aerodynamic performance of the blade can be reduced.

[0021] Optionally, the air bag is made of at least one of rubber, plastic and polyvinyl chloride film, and the air bag is filled with air or nitrogen.

[0022] Optionally, the chordwise cross section of the air bag is at least one of a quadrilateral, a triangle, a circle, a semicircle, an ellipse and a polygon with more than four sides. The chordwise cross section of the hollow hole is at least one of a quadrilateral, a triangle, a circle, a rhombus, a semicircle, an ellipse and a polygon with more than four sides. The hollow hole penetrates the air bag along the spanwise direction of the blade. Since the spanwise direction of the blade can be the long axis direction of the air bag, arranging the hollow hole along the spanwise direction of the blade can increase the space occupied by the corresponding hollow hole.

[0023] According to another aspect of the present application, a wind turbine generator set is provided, which includes the blade as described above. BRIEF DESCRIPTION OF DRAWINGS

[0024] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0025] Figure 1 is a schematic view showing a chordwise cross section of a blade according to an embodiment of the present application;

[0026] Figure 2 is an exploded view schematically showing a section of a blade according to an embodiment of the present application;

[0027] Figure 3 is a view schematically showing a mounted state of an air bag in a blade according to an embodiment of the present application;

[0028] Figure 4 is a view schematically showing a spanwise view of a blade according to an embodiment of the present application;

[0029] Figure 5 is a view schematically showing a combined shape of an air bag and a hollow hole according to an embodiment of the present application.

[0030] Reference numerals: 11 is a suction surface shell, 12 is a pressure surface shell, 13 is a web, 14 is a front cavity, 15 is a rear cavity, 16 is a leading edge, 17 is a trailing edge, 20 is an air bag, 21 is a front cavity air bag, 22 and 23 are rear cavity air bags, 20a, 21a, 22a, and 23a are hollow holes, 31 is a front cavity baffle, 32 is a rear cavity baffle, 14a is a front cavity sub-space, 15a is a rear cavity sub-space, 20b is an air nozzle. DETAILED DESCRIPTION

[0031] Hereinafter, a blade and a wind power generator set according to an embodiment of the present application will be described in detail with reference to the accompanying drawings.

[0032] Figure 1 is a view schematically showing a chordwise cross-sectional view of a blade according to an embodiment of the present application, Figure 2 is an exploded view schematically showing a section of a blade according to an embodiment of the present application, Figure 3 is a view schematically showing a mounted state of an air bag in a blade according to an embodiment of the present application, Figure 4 is a view schematically showing a spanwise view of a blade according to an embodiment of the present application, Figure 5 is a view schematically showing a combined shape of an air bag and a hollow hole according to an embodiment of the present application.

[0033] Reference Figures 1 to 4 , a blade according to an embodiment of the present application can include a suction surface shell 11 and a pressure surface shell 12, a web 13 supported between the suction surface shell 11 and the pressure surface shell 12 along a spanwise direction of the blade, dividing an inner cavity of the blade into a front cavity 14 located at a leading edge side and a rear cavity 15 located at a trailing edge side, and an air bag 20 provided in at least one of the front cavity 14 and the rear cavity 15, the air bag 20 being filled with a gas and being in contact with an inner surface of the front cavity 14 or the rear cavity 15.

[0034] As Figure 1 and Figure 2As shown, the blade may include a suction surface shell 11 and a pressure surface shell 12 joined together. A web 13 is supported between the suction surface shell 11 and the pressure surface shell 12 along the spanwise direction of the blade. Although Figure 1 and Figure 2 Only one web 13 is shown in the figure, but the blade according to an embodiment of the invention may have a double web structure, that is, it may include two webs that are separated from each other along the chord of the blade.

[0035] According to an embodiment of the present invention, the web 13 divides the blade cavity into a front cavity 14 located on the leading edge 16 side and a rear cavity 15 located on the trailing edge 17 side. When the blade includes two webs 13, the front cavity 14 is the space between the web 13 closest to the leading edge 16 and the leading edge 16, and the rear cavity 15 is the space between the web 13 closest to the trailing edge 17 and the trailing edge 17.

[0036] According to an embodiment of the present invention, the airbag 20 may be disposed in at least one of the front cavity 14 and the rear cavity 15. The airbag 20 is filled with gas such that the airbag 20 can inflate to conform to the inner surface of the front cavity 14 or the rear cavity 15. The inner surface of the front cavity 14 or the rear cavity 15 may include the inner surface of the blade and / or the surface of the web.

[0037] According to an embodiment of the present invention, by providing an airbag 20 in at least one of the front cavity 14 and the rear cavity 15, when the blade deforms, a relative shearing motion occurs between the airbag 20 and the blade surface. Under the action of the internal air pressure of the airbag 20, the frictional force between the airbag 20 and the blade surface is large, which can increase the structural damping of the blade itself. Therefore, the blade according to the embodiment of the present invention can simultaneously improve the structural damping of the blade in both low-order and high-order modes, and can reduce blade impact and fatigue loads, as well as blade stall flutter or bending-torsional coupling flutter.

[0038] According to an embodiment of the present invention, the main body material of the airbag 20 is a flexible material, which can form a cavity and can be filled with gas. As an example, the main body material of the airbag 20 can be at least one of rubber, plastic, and polyvinyl chloride film. As an example, the gas in the airbag 20 is air or nitrogen.

[0039] According to embodiments of the present invention, such as Figure 5 As shown, the airbag 20 may include a hollow hole 20a, which can penetrate the airbag 20. According to an embodiment of the present invention, when the blade deforms, the hollow hole 20a makes the airbag 20 easier to deform, thus allowing the airbag 20 to fit more tightly against the inner surface of the blade, increasing the friction area with the inner surface of the blade, and further increasing the structural damping. According to an embodiment of the present invention, as Figure 3As shown, the air bag 20 can include an air nozzle 20b. The air nozzle 20b can penetrate the pressure surface shell 12 and be fixed to the surface of the blade. Specifically, an inflation hole (not shown) is provided at the position of the pressure surface shell 12 corresponding to the air nozzle 20b, and the air nozzle 20b can pass out of the inflation hole and be fixed to the surface of the blade by a bolt or the like. Compared with providing the inflation hole on the suction surface shell 11, the aerodynamic performance of the blade is less affected by providing the inflation hole on the pressure surface shell 12.

[0040] According to embodiments of the present application, the air bag 20 can be arranged in the front cavity 14 and / or the rear cavity 15 of the blade when the suction surface shell 11 and the pressure surface shell 12 are closed, and the air bag 20 is inflated after the closing.

[0041] According to embodiments of the present application, as shown in Figure 1 、 Figure 2 and Figure 4 , the blade can include a plurality of front cavity baffles 31. The plurality of front cavity baffles 31 are supported between the suction surface shell 11 and the pressure surface shell 12 in the front cavity 14, and the plurality of front cavity baffles 31 are separated from each other in the spanwise direction of the blade to divide the front cavity 14 into a plurality of front cavity subspaces 14a.

[0042] According to embodiments of the present application, the air bag 20 can include a plurality of front cavity air bags 21, and at least one front cavity air bag 21 is arranged in each front cavity subspace 14a. The front cavity baffles 31 can be used to separate and fix the front cavity air bags 21 to prevent the front cavity air bags 21 from moving in the spanwise direction of the blade.

[0043] According to embodiments of the present application, the front cavity subspaces 14a can be divided according to the shape changes in the spanwise direction of the front cavity 14, so that the shape changes of each front cavity subspace 14a are small. According to embodiments of the present application, by dividing the front cavity 14 into a plurality of front cavity subspaces 14a and arranging at least one front cavity air bag 21 in each front cavity subspace 14a, the shape of the front cavity air bag 21 can be more easily designed according to the shape of each front cavity subspace 14a, so that the front cavity air bag 21 better fits the wall surface of the front cavity subspace 14a, thereby further increasing the structural damping of the blade itself.

[0044] As shown in Figure 1 、 Figure 2 and Figure 4 , one front cavity air bag 21 is arranged in each front cavity subspace 14a. As an example, the front cavity air bag 21 can have an ellipsoidal shape, and the area of the chordwise cross section of the middle part of the ellipsoidal shape is the largest, and gradually decreases towards the blade root and blade tip directions.

[0045] It should be understood that, although Figure 1 、 Figure 2 and Figure 4In the drawings, only one front cavity air bag 21 is shown as being provided in one front cavity sub-space 14a, but the present application is not limited thereto. Since the shape of the front cavity 14 is irregular, in order to make the front cavity air bag 21 better fit the inner surface of the blade, at least two front cavity air bags 21 can be provided according to the shape of the front cavity sub-space 14a, so that the front cavity air bag 21 better fits the wall surface of the front cavity sub-space 14a, and the structural damping of the blade is improved.

[0046] According to the embodiment of the present application, at least two front cavity air bags 21 having different shapes from each other can be provided in each front cavity sub-space 14a, so that the shape of the at least two front cavity air bags 21 can be designed according to the shape change of the front cavity sub-space 14a in the chordwise direction, to improve the contact area of the front cavity air bag 21 with the inner surface of the front cavity sub-space 14a. In addition, the at least two front cavity air bags 21 having different shapes from each other can fit each other, so that when the blade deforms, the front cavity air bags 21 can rub against each other in addition to rubbing against the inner surface of the blade, to release vibration energy in the form of friction heat, thereby improving the structural damping of the blade.

[0047] According to the embodiment of the present application, Figure 2 and Figure 4 The front cavity air bag 21 shown in the drawings is in the initial shape of the front cavity air bag 21, and when installed in the front cavity sub-space 14a, the front cavity air bag 21 deforms to fit the inner surface of the blade or the web.

[0048] It should be understood that, Figure 4 In the drawings, only the front cavity air bag 21 provided in one front cavity sub-space 14a is shown for simplicity, but the front cavity air bag 21 is also provided in the other front cavity sub-spaces 14a. Also, according to the different shapes of the front cavity sub-spaces 14a, the number and shape of the front cavity air bags 21 in each front cavity sub-space 14a can be the same or different, without specific limitation.

[0049] According to the embodiment of the present application, as shown in Figure 1 , Figure 2 and Figure 4 Each front cavity baffle 31 includes at least two front cavity baffle portions separated from each other in the chordwise direction of the blade.

[0050] According to the embodiment of the present application, as shown in Figure 1 and Figure 2 One end of each front cavity baffle portion in the thickness direction of the blade can be coupled to the suction surface shell 11, and the other end can be coupled to the pressure surface shell 12. As shown in Figure 1 and Figure 2As shown in FIG. 1, each front cavity baffle 31 can be divided into two front cavity baffle sections along the chord direction of the blade, one of which is arranged close to the web 13, and the other of which is arranged close to the leading edge 16 of the blade. However, the present application is not limited thereto, and the specific arrangement position of the front cavity baffle sections is not specifically limited.

[0051] According to the embodiment of the present application, the front cavity air bags 21 adjacent to each other in the span direction of the blade are attached to each other through the space between the front cavity baffle sections. By attaching the front cavity air bags 21 adjacent to each other in the span direction to each other, the front cavity air bags 21 attached to each other can rub against each other when the blade deforms, so as to release vibration energy in the form of friction heat, thereby improving the structural damping of the blade.

[0052] According to the embodiment of the present application, the width of each front cavity baffle section in the chord direction of the blade is 1 / 20-1 / 5 of the chord length of the blade at the position, so as to increase the attachment area between the air bags adjacent to each other in the span direction and improve the structural damping of the blade without significantly increasing the weight of the blade. If the width of each front cavity baffle section in the chord direction of the blade is less than 1 / 20 of the chord length of the blade at the position, the front cavity baffle section can be insufficient to block the front cavity air bags 21 from moving along the span direction of the blade. If the width of each front cavity baffle section in the chord direction of the blade is greater than 1 / 5 of the chord length of the blade at the position, the space between the front cavity baffle sections can be too small to cause the attachment area between the front cavity air bags 21 adjacent to each other in the span direction of the blade to be too small, and in addition, the weight of the front cavity baffle can be too heavy to increase the weight of the blade.

[0053] According to the embodiment of the present application, the blade can include a plurality of rear cavity baffles 32. The plurality of rear cavity baffles 32 are supported between the suction surface shell 11 and the pressure surface shell 12 in the rear cavity 15, and the plurality of rear cavity baffles 32 are separated from each other in the span direction of the blade to divide the rear cavity 15 into a plurality of rear cavity subspaces 15a.

[0054] According to the embodiment of the present application, the air bags 20 can include a plurality of rear cavity air bags, and at least one rear cavity air bag is arranged in each rear cavity subspace 15a. The rear cavity baffles 32 can be used to separate and fix the rear cavity air bags, so as to prevent the rear cavity air bags from moving along the span direction of the blade.

[0055] According to the embodiment of the present application, the rear cavity subspaces 15a can be divided according to the shape change of the rear cavity 15 in the span direction, so that the shape change of each rear cavity subspace 15a is small. According to the embodiment of the present application, by dividing the rear cavity 15 into a plurality of rear cavity subspaces 15a and arranging at least one rear cavity air bag in each rear cavity subspace 15a, the shape of the rear cavity air bag can be more easily designed according to the shape of each rear cavity subspace 15a, so that the rear cavity air bag better attaches to the wall surface of the rear cavity subspace 15a, thereby further increasing the structural damping of the blade itself.

[0056] As shown in Figure 1 , Figure 2 and Figure 4 , two rear cavity air bags 22 and 23 are arranged in each rear cavity sub-space 15a, and the shapes of the two rear cavity air bags 22 and 23 are different from each other, so that the shapes of the two rear cavity air bags 22 and 23 can be designed according to the shape of the rear cavity sub-space 15a in the chord direction to increase the contact area between the two rear cavity air bags 22 and 23 and the inner surface of the rear cavity sub-space 15a. The two rear cavity air bags 22 and 23 can be in contact with each other, so that when the blade deforms, the two rear cavity air bags 22 and 23 in contact with each other can rub against each other to release vibration energy in the form of friction heat, thereby improving the structural damping of the blade.

[0057] As an example, the rear cavity air bag 22 near the web 13 among the two rear cavity air bags 22 and 23 has a truncated cone shape Figure 2 or a cylindrical shape Figure 4 , and the rear cavity air bag 23 near the trailing edge 17 of the blade among the two rear cavity air bags 22 and 23 has a cylindrical shape Figure 2 or a triangular prism shape Figure 4 .

[0058] According to the embodiment of the present application, Figure 2 and Figure 4 , the three-dimensional structure of the rear cavity air bag 22 and 23 shown in the above is the initial shape of the rear cavity air bag 22 and 23, and when the rear cavity air bag 22 and 23 is installed in the rear cavity sub-space 15a, the rear cavity air bag 22 and 23 will deform to be in contact with the inner surface of the blade or the web or the two rear cavity air bags 22 and 23 will be in contact with each other.

[0059] It should be understood that, although Figure 1 , Figure 2 and Figure 4 only show that two rear cavity air bags 22 and 23 are arranged in one rear cavity sub-space 15a, the present application is not limited thereto, and only one rear cavity air bag can be arranged in each rear cavity sub-space 15a. In addition, more than three rear cavity air bags can also be arranged according to the shape of the rear cavity sub-space 15a to better contact the inner surface of the blade with the rear cavity air bag and improve the structural damping of the blade.

[0060] It should be understood that, Figure 4 in order to be brief, only the rear cavity air bags 22 and 23 arranged in one rear cavity sub-space 15a are shown, but the rear cavity air bags 22 and 23 are also arranged in other rear cavity sub-spaces 15a. And according to the different shapes of the rear cavity sub-spaces 15a, the number and shape of the rear cavity air bags in each rear cavity sub-space 15a can be the same or different, without specific limitation.

[0061] According to the embodiment of the present application, as shown in Figure 1 , Figure 2 and Figure 4As shown in FIG. 1, each of the rear cavity baffle plates 32 includes at least two rear cavity baffle plate portions separated from each other in the chordwise direction of the blade.

[0062] According to an embodiment of the present application, as shown in FIG. 1, Figure 1 and Figure 2 As shown in FIG. 1, each of the rear cavity baffle plate portions is coupled to the suction surface shell 11 at one end in the thickness direction of the blade and to the pressure surface shell 12 at the other end. As shown in FIG. 1, Figure 1 and Figure 2 As shown in FIG. 1, each of the rear cavity baffle plates 32 can be divided into two front cavity baffle plate portions in the chordwise direction of the blade, one of which is disposed close to the web 13 but not in contact with the web 13, and the other of which is disposed close to the trailing edge 17 of the blade. However, the present application is not limited thereto, and the specific disposition position of the front cavity baffle plate portions is not particularly limited.

[0063] According to an embodiment of the present application, the rear cavity air bags 22 and 23 adjacent to each other in the spanwise direction of the blade are in contact with each other through the space between the rear cavity baffle plate portions. By making the rear cavity air bags 22 and 23 adjacent to each other in the spanwise direction in contact with each other, when the blade is deformed, the rear cavity air bags 22 and 23 adjacent to each other in the spanwise direction can rub against each other to release vibration energy in the form of friction heat, thereby improving the structural damping of the blade.

[0064] According to an embodiment of the present application, the width of each of the rear cavity baffle plate portions in the chordwise direction of the blade is 1 / 20-1 / 5 of the chord length of the blade at the position. If the width of each of the rear cavity baffle plate portions in the chordwise direction of the blade is less than 1 / 20 of the chord length of the blade at the position, the rear cavity baffle plate portions can not be sufficient to block the rear cavity air bags 22 and 23 from moving in the spanwise direction of the blade. If the width of each of the rear cavity baffle plate portions in the chordwise direction of the blade is greater than 1 / 5 of the chord length of the blade at the position, the space between the rear cavity baffle plate portions can be too small to allow the rear cavity air bags 22 and 23 adjacent to each other in the spanwise direction of the blade to be in contact with each other, and in addition, the weight of the rear cavity baffle plate can be too heavy to increase the weight of the blade.

[0065] According to an embodiment of the present application, as shown in FIG. 1, Figure 4 the plurality of front cavity sub-spaces 14a and the plurality of rear cavity sub-spaces 15a correspond to each other in the chordwise direction of the blade. That is, the front cavity sub-spaces 14a and the rear cavity sub-spaces 15a are divided at positions corresponding to each other in the front cavity 14 and the rear cavity 15. However, the disposition method of the front cavity sub-spaces 14a and the rear cavity sub-spaces 15a is not limited thereto.

[0066] According to an embodiment of the present application, as shown in FIG. 1, Figure 1 and Figure 2 As shown in FIG. 1, the front cavity air bag 21 has a hollow hole 21a penetrating the front cavity air bag 21, and the rear cavity air bags 22 and 23 have hollow holes 22a and 23a penetrating the rear cavity air bags 22 and 23. In addition, as shown in FIG. 1, Figure 2As shown, the hollow hole 21a can penetrate the front cavity bladder 21 in the spanwise direction of the blade, and the hollow holes 22a and 23a can penetrate the rear cavity bladders 22 and 23, respectively, in the spanwise direction of the blade. Since the spanwise direction of the blade is the long axis direction of the front cavity bladder 21 and the rear cavity bladders 22 and 23, the hollow hole 21a, the hollow holes 22a and 23a arranged in the spanwise direction of the blade can increase the space occupied by the corresponding hollow hole.

[0067] According to an embodiment of the present application, as shown in Figure 4 As shown, the front cavity bladder 21 and the rear cavity bladders 22 and 23 are distributed in the range of one-third to four-fifths of the distance from the root of the blade in the spanwise direction of the blade. This is because the blade is deformed little near the root of the blade, and it is unnecessary to arrange the bladders, and near the position of the blade tip, the inner cavity of the blade is small, and there is not enough space to arrange the bladders.

[0068] According to an embodiment of the present application, the surface of the bladder 20 can be provided with protrusions (not shown). When the surface of the bladder 20 is provided with protrusions, the friction between the bladder 20 and the inner wall surface of the blade, the friction between the bladder 20 and the web 13, and the friction between the adjacent bladders 20 adhering to each other can be increased, so that the structural damping of the blade can be further improved. As an example, the surface of each of the front cavity bladder 21 and the rear cavity bladders 22 and 23 can be provided with protrusions. The protrusions can be distributed on the entire surface or part of the surface of the front cavity bladder 21, the rear cavity bladders 22 and 23.

[0069] According to an embodiment of the present application, the "protrusion" can refer to any structure that increases the surface roughness of the bladder 20 (greater than the surface roughness of the bladder 20 without the protrusion). As an example, the protrusion can be a round, triangular or other shaped protrusion protruding from the surface of the corresponding bladder 20. However, the present application is not limited thereto. For example, the protrusion can also be provided on the surface of the bladder 20 by applying other materials (for example, any material with a surface roughness greater than the main body material of the bladder 20) to the surface of the bladder 20.

[0070] According to an embodiment of the present application, as shown in Figure 5 The chordwise cross section of the bladder 20 (including the front cavity bladder 21 and the rear cavity bladders 22 and 23) can be at least one of a quadrilateral (for example, a trapezoid, a square, a rectangle, a rhombus with an angle not equal to 90°), a triangle, a circle, a semicircle, an ellipse, and a polygon with more than four sides.

[0071] According to an embodiment of the present application, as shown in Figure 5 The chordwise cross section of the hollow hole 20a (including the hollow hole 21a and the hollow holes 22a and 23a) can be at least one of a quadrilateral (for example, a trapezoid, a square, a rectangle, a rhombus with an angle not equal to 90°), a triangle, a circle, a semicircle, an ellipse, and a polygon with more than four sides.

[0072] According to the embodiment of the present application, the air bags 20 and the hollow holes 20a can be combined in any shape without specific limitation.

[0073] According to the embodiment of the present application, as an example, the air bags 20 can be installed by the following described method.

[0074] When the suction surface shell 11 and the pressure surface shell 12 are closed, the air bags 20 are arranged in the front cavity 14 and / or the rear cavity 15 of the blade, the inflation holes are drilled on the pressure surface shell 12 of the blade, the air nozzles 20b of the air bags 20 without inflation are passed through the inflation holes, and are fixed to the surface of the blade by bolts or the like.

[0075] Then, one air bag 20 can be inflated through the air nozzle 20b, and the internal air pressure of the air bag 20 can be monitored by the air pressure gauge, when reaching 80% of the specified air pressure, the inflation is stopped, and the next air bag 20 is inflated. When all the air bags 20 reach 80% of the specified air pressure, the air bags 20 are sequentially inflated to reach the specified air pressure. By this method, the air pressure of the plurality of air bags 20 is uniform, and the adjacent air bags 20 are tightly rubbed.

[0076] According to the embodiment of the present application, the specified air pressure of each air bag 20 can be determined according to the fitting state of the air bag 20 and the inner surface of the front cavity 14 or the rear cavity 15. For example, the air pressure of the state that the air bag 20 is fitted with the inner surface of the front cavity 14 or the rear cavity 15 without excessively pressing the front cavity 14 or the rear cavity 15 can be determined as the specified air pressure of the air bag 20.

[0077] In addition, after the air bags 20 are installed, the air bags 20 need to be regularly maintained and maintained. As an example, the air pressure of the air bags 20 can be comprehensively checked every 2-3 years. The checking method can be: in the state that the unit is stopped, the impeller is locked, the tip of one blade is vertically directed to the ground, the checking personnel is lifted to the inflation hole position of the blade by the aerial basket, and the air pressure of the air bag 20 is detected. When the air pressure of the air bag 20 is insufficient, the air is supplemented.

[0078] According to the embodiment of the present application, a wind turbine generator is also provided, which comprises the blade as described above.

[0079] According to the present application, by arranging the air bags in at least one of the front cavity and the rear cavity, when the blade is deformed, the relative shear motion occurs between the air bags and the surface of the blade, under the action of the internal air pressure of the air bags, the friction between the air bags and the surface of the blade is large, which can increase the structural damping of the blade itself. Therefore, the blade according to the present application can simultaneously improve the structural damping of the blade under the low-order mode and the high-order mode, and can reduce the impact and fatigue load of the blade and the stall flutter or the bending-torsional coupled flutter of the blade.

[0080] In addition, according to the present application, by providing the hollow holes penetrating the air bag in the air bag to make the air bag have a hollow structure, the air bag can be deformed more easily when the blade is deformed, so the air bag can be more closely attached to the inner surface of the front cavity or the rear cavity, increasing the friction area with the same, further increasing the structural damping.

[0081] In addition, according to the present application, by dividing the front cavity and the rear cavity into a plurality of front cavity subspaces and a plurality of rear cavity subspaces, the shape of the air bag can be designed according to the shape change of the blade inner cavity, so that the air bag is better attached to the inner surface of the front cavity or the rear cavity, thereby further increasing the structural damping.

[0082] According to the present application, the air bags adjacent to each other in the blade span direction are attached to each other, and the air bags provided in the same subspace are attached to each other, so the structural damping can be further increased.

[0083] Although the exemplary embodiments of the present application have been described with reference to the example embodiments thereof, it should be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the present application as defined by the appended claims.

Claims

1. A vane, characterized in that The blade comprises: a suction surface shell (11) and a pressure surface shell (12); a web (13) supported between the suction surface shell (11) and the pressure surface shell (12) along a spanwise direction of the blade, dividing a blade inner cavity into a front cavity (14) on a leading edge side and a rear cavity (15) on a trailing edge side; an air bag (20) provided in at least one of the front cavity (14) and the rear cavity (15), the air bag (20) being filled with gas and being in contact with an inner surface of the front cavity (14) or the rear cavity (15), wherein the blade comprises a plurality of front cavity baffles (31) supported between the suction surface shell (11) and the pressure surface shell (12) in the front cavity (14), the plurality of front cavity baffles (31) being separated from each other along a spanwise direction of the blade to divide the front cavity (14) into a plurality of front cavity subspaces (14a), wherein the air bag (20) comprises a plurality of front cavity air bags (21), at least one of the front cavity air bags (21) being provided in each of the plurality of front cavity subspaces (14a), wherein each of the front cavity baffles (31) comprises at least two front cavity baffle sections separated from each other in a chordwise direction of the blade, the front cavity air bags (21) adjacent to each other in the spanwise direction of the blade being in contact with each other through a space between the front cavity baffle sections.

2. The blade of claim 1, wherein The air bag (20) comprises a hollow hole (20a) penetrating the air bag (20).

3. The blade of claim 1, wherein At least two of the front cavity air bags (21) provided in each of the plurality of front cavity subspaces (14a) are in contact with each other, shapes of the at least two of the front cavity air bags (21) being different from each other.

4. The blade of claim 1, wherein A width of each front cavity baffle section in the chordwise direction of the blade is 1 / 20-1 / 5 of a chord length of the blade at the position.

5. The blade of claim 1, wherein The blade comprises a plurality of rear cavity baffles (32) supported between the suction surface shell (11) and the pressure surface shell (12) in the rear cavity (15), the plurality of rear cavity baffles (32) being separated from each other along a spanwise direction of the blade to divide the rear cavity (15) into a plurality of rear cavity subspaces (15a).

6. The blade of claim 5, wherein The air bag (20) comprises a plurality of rear cavity air bags (22, 23), at least one of the rear cavity air bags (22, 23) being provided in each of the plurality of rear cavity subspaces (15a).

7. The blade of claim 6, wherein At least two of the rear cavity air bags (22, 23) provided in each of the plurality of rear cavity subspaces (15a) are in contact with each other, shapes of the at least two of the rear cavity air bags (22, 23) being different from each other.

8. The blade of claim 6, wherein Each of the rear cavity baffles (32) comprises at least two rear cavity baffle sections separated from each other in a chordwise direction of the blade, a width of each rear cavity baffle section in the chordwise direction of the blade is 1 / 20-1 / 5 of a chord length of the blade at the position, The rear cavity air bags (22, 23) adjacent to each other in the spanwise direction of the blade are in contact with each other through a space between the rear cavity baffle sections.

9. The blade of claim 6, wherein, The front cavity air bag (21) and the rear cavity air bags (22, 23) are distributed in the range of one third to four fifths of the distance from the blade root in the spanwise direction of the blade.

10. The blade of claim 6, wherein The front cavity air bag (21) has an ellipsoid shape, the area of the chordwise cross section of the middle part of the ellipsoid shape is the largest, and the area of the chordwise cross section of the ellipsoid gradually decreases towards the blade root and the blade tip, Two rear cavity air bags (22, 23) are arranged in each of the plurality of rear cavity subspaces (15a), the rear cavity air bag (22) close to the web (13) among the two rear cavity air bags (22, 23) has a truncated cone shape or a cylindrical shape, and the rear cavity air bag (23) close to the trailing edge (17) of the blade among the two rear cavity air bags (22, 23) has a triangular prism shape or a cylindrical shape.

11. The blade according to claim 1 or 2, characterized in that A protrusion is arranged on the surface of the air bag (20).

12. The blade of claim 1 or 2, wherein The blade includes an inflation hole that penetrates the pressure surface shell (12), The air bag (20) includes a gas nozzle (20b) that penetrates from the inflation hole and is fixed to the surface of the blade.

13. The blade of claim 1 or 2, wherein The air bag (20) is made of at least one of rubber, plastic and polyvinyl chloride film, The air bag is filled with air or nitrogen.

14. The blade of claim 2, wherein, The chordwise cross section of the air bag (20) is at least one of quadrilateral, triangle, circle, semicircle, ellipse and polygon with more than four sides, The chordwise cross section of the hollow hole (20a) is at least one of quadrilateral, triangle, circle, rhombus, semicircle, ellipse and polygon with more than four sides, The hollow hole (20a) penetrates the air bag (20) in the spanwise direction of the blade.

15. A wind power unit, characterized in that The wind turbine generator set includes the blade according to any one of claims 1 to 14.

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